DE2209649B1 - PCM-TIME MULTIPLEX MEDIATION PROCEDURE - Google Patents

Description

3 4

based on two time channels within a pulse frame, partial information therefore

mens are distributed (NTZ 1967, No. 11, p. 667 until rerer time channels are distributed, their time interval

682, 678). is equidistant, accordingly that for a connection

With such a treatment of room or time level parts used in telecommunications, each for additional

image or radio information transmitted in networks 5 related partial information signals more

In terms of time, the distribution of the same would not be used to a great extent. This procedure is invented

equally spaced time channels for education, characterized in that the transmission

use of combination tones and thus to increase only one time channel.

lead to an increase in the distortion factor. the information on one of a time

In addition, there is a high probability that the order of the individual partial information on the plex line would no longer be the same as long time channels from the output of the exchange as at a time interval of at least one time slot, since these were formed in the individual exchanges Rows of equidistant time channels selected management positions in the assignment of the outgoing and occupied until all time channels of the respective next free time channels under the respective row are occupied, after which time different time channel conversions experience. For this reason, given a known distance-determined series of equidistant time channel time division multiplex transmission systems with pulse amplitudes until all time channels of the den modulation (PAM, which except for the speech-related series are occupied) are selected and occupied will,
Transmission also serves to transmit music, a distribution that, according to the invention, when selecting the division of the music information into equidistant time channels, the time channels are used for only one time channel. which, as required, in addition to several time slots

The retention of the information that is required for one and the same connection, for example time channels belonging to the broadcast, on which a larger broadcast information is to be transmitted, sampling frequency that requires voice information is not selected randomly, but information is transmitted in each case, is the case with the latter the aspect of leaving rows is facilitated by the fact that the space or time levels used for equidistant time channels can largely be avoided in such time channel rows that would lead to blockages, ie the crosspoints and buffers ,
In the following, the method connection according to the invention, the intermediate storage even for each of them, will be explained in more detail with reference to 3 figures, in connection establishment direction and in connection F i g. 1 shows schematically a part of a PCM telecommunications system which has signals transmitted in three opposite direction to the exchange structure. 35 network;

According to this procedure, measures are also taken. 2 shows the time channel relationships in one of the

men that are used in a connection switching centers when switching one to several

call setup information distributed over several switching levels back time channels;

away, connect to individual exchanges- Fig. 3 clarifies using a time channel allocation

The series of equivalents corresponding to the sections of the route corresponds to the type of training

stater time channels are not free. This choice of measures to go out from an exchange

consist in that on connecting path pieces, the occupying time channels.

between the first and the last stretch of the path, in the one shown in FIG. 1 extracts gen shown, not aufrechter- the equidistance of the subchannels PCM-telecommunication network are PCM-time-division behavior is that Si be mutually transferred 45 switching centers A, C and B via gnale in time slots on these spans rather whose temporal four wire correctly operated PCM time division multiplex line uncher spacing is arbitrary. This is precisely what results in connected genes.

but again the danger mentioned above, the direction of the arrow indicated in the figure

that the order of the subchannels is not preserved speaks the direction of transmission of the relevant

remain. 50 fenden PCM time division multiplex line. The single ones

The object of the invention is therefore the connection PCM time division multiplex lines are shown in the figure

communication structure in a PCM telecommunications network, in which the designations for the type of connection

several part-time channels within a sampling pulse- time channels required by the exchanges

are to be conveyed in such a way that they are provided as they are from the point of view of the

on the one hand, the retention of the sequence of sub-digit C represents. According to this, Aan denotes the time

channels and, on the other hand, the avoidance of inner channels that are in the direction of connection establishment of the

Blockages are largely avoided. PCM time division switching center A to the

The invention thus relates to a method for the PCM time division multiplex switching center B in the

Connection establishment in a PCM multi-PCM exchange C incoming are busy,

plex lines connected time-division multiplex 60 Bab which in connection establishment direction according to

Comprehensive PCM telecommunication network, time channels to be assigned in switching center B,

the next beanspruchen- only one timeslot Ban in connection opposite direction of

the information to switch such information to switching center B to switching center A at

are whose incoming bit switching point C to be transmitted per unit of time occupied time channels

number of the sampling frequency and the number of bits each 65 and Aab those in the opposite direction in connection establishment in

Time devoted to multiple network's bit rate exceeds the outgoing switch C to be occupied

and / or which are coded in a code whose bit time channels,

number exceeds that of a time factor and the 2 a placement service

gang explained in the event that the sem case to be transferred is an 8-fold exploitation of the relevant

Information distributed over four time channels w, x, y and ζ results in a memory cell. Corresponding conditions

is. As the line Aan of Fig.2 shows, which are at the crosspoints of the space level one

relevant time channel conditions on the in connection switching center, which are also issued several times

application build-up direction at the exchange C can be used.

On the basis of the multiple utilization mentioned, these four time channels are distributed equidistantly, although it is relatively easy to use the switching elements of the exchange, for example channels with the numbers 5, to occupy the order of the individual 13, 21 and 29. In the search for connection subchannels over several switching stages dungsaufbaunchtung to keep outgoing free io to be occupied, it can, however, unless special time channels could now, as in the cases in which measures are taken, as a result of not only information is transmitted to the channel in a single time series of equidistant time channels, the next free outgoing PCM time division multiplex lines are selected for blocking time channels, which, however, will come as planned. Explained by appropriate measures, there is a risk that the 15, when selecting time channels, are assigned the information lost in the original order of the time channels, which only commit one time channel, or that a high distortion factor occurred, creates the invention remedy here what occurs. It will therefore, as line Bob of the F i g. 2 below with reference to FIG. 3 shows, explained in more detail, than is depicted in the connection establishment direction.

outgoing PCM time division multiplex line to be occupied 20 From the consideration that with the compatible time channels Equidistant time channels are also selected from the PCM basic systems, the channel with which the channel is selected, which each have the same channel spacing number 0 and the channel with channel number 16 like those arriving in the connection establishment direction, not for information transmission but rather to syncs Time channels, so here example chronization and signaling purposes are shown the channels with the channel numbers 3, 11, 19, 25 are used, see line 1 of the FIG. 3, from the beginning and 27 occupied. in only 14 even-numbered channels compared to 16

In the case of the FIG. 2 explained example odd-numbered channels are available, it is also assumed that the pulse frames are started with the occupancy of individual channels with all PCM time division multiplex lines leading to the exchange C and from this that initially all even-numbered channels are selected. Out of the remaining 16 odd numbers are nized. Since, in addition, in both transmission channels, see line 2 of FIG. 3, in each case the same time channel within the supply of individual channels is always free time channels one of the respective on the office pulse frame of the relevant and the same equidistant row selected, i.e. channels 3, 7, 11 and so on passing through the transmission-side switching center, for example, pulse frame is used, lie with the selection 35 so that, as long as time channels are free in this row, the row of equidistant time channels to be occupied going out in the connection setup direction, the time channels Bab also already the for the channels 1, 5, 9, 13, etc., see line 3 of FIG. 3, in the opposite direction of the establishment of the bond, the time to be occupied is kept free. This series can then in Benäle, namely the in-bound channels occupied time may fall, for example, with two groups of four to-Ban, and which are assigned to outgoing time channels occupying Aab 4 ° sammengehöriger time channels. In entfest, which means that the required equidistance is also speaking for them, provided that individual channels are given. are occupied, from the time table shown in line 3

From Fig. 2 you can also see that the times when the time channels 5, 13, 21 and 29 are selected,

during which the information to be conveyed see line 4, which is also part of an equidistant

are also 45 th row for the purpose of implementing their time channel position. So in the end there still remain

the PCM arriving in the direction of transmission, the two time channels 1 and 17, see line 5 in FIG. 3,

Time division multiplex lines in free time channel positions in which are occupied for the transmission of information

Transmission direction outgoing lines can be stored, which requires two time channels,

not overlap. It is of course not absolutely necessary

and borrowed the same in the switching center of the intermediate 50, as described, with the time channel selection

Storage cell serving for both the even-numbered and odd-numbered time channels

Transmission direction as well as in the transmission direction, it can also be done with time channels

Information transmitted in the direction used is started to be used at a fewer time channels

den, for all four channels, so that they belong in the comprehensive series.

1 sheet of drawings

Claims (1)

1 2 namely to the time channels that are on these lines Claims: are allocated to the individual compounds. To the four-wire operation of the PCM time module 1. Procedure for establishing a connection in a tiplex exchange arriving or from 5 outgoing PCM time division multiplex lines connected there via PCM time division multiplex lines Comprehensive speaking, it is always a four-PCM telecommunications network, in which, in addition to single-wire connection, d. that is, at the Durchlich Information requiring a time channel is in both directions of transmission conveying such information is a separate consideration. For those who are over there is their IO transmission to be transmitted per time unit in the course of a call connection Number of bits the binary words transmitted from the sampling frequency and number of bits via one with such per time slot resulting network-specific bit rate switching center connected, exceeded four-wire-wise and / or the PCM time division multiplex line encoded in a code in the usual way, whose number of bits exceeds that of a time slot with regard to control simplicity and their partial information therefore on 15 chungen regarding the togetherness of the for the time slots of several time channels are distributed, each of which uses both transmission directions whose time interval is equidistant, accordingly the time channels in the individual time division multiplex switches a connection used space or newspaper stations, in both transmission directions each stage part in each case for associated partial because the same time channel within the respective information is used multiple times, 20 on the office pulse frame of the relevant transmission characterized in that the pulse frame passing to the current exchange uses transmission of only one time channel (see e.g. Proc. IEE 111 [1964] 12, 1976 claiming information on one of one to 1980,1976). Time-division switching center outgoing on the basis of agreements are in such PCM time division multiplex line for as long as 25 PCM telephone exchanges channels from one by a time interval of PCM telecommunications networks the voice signals usually at least one time series formed equi- with a frequency of 8 kHz sampled, which distant time channels (e.g. 2, 4, 6 ... 30) result in a sampling pulse frame length of 125us. the are selected and assigned until all time code binary words that are used to represent the type of channels of the row in question are occupied, after which 30 sampled amplitude instantaneous values of the speech each time channels from one another are used by a gnals, assign to this compatible system other time slot spacing specific series of 8 bits. The temporal nesting to different equidistant time channels (e.g. 3, 7, 11 ... 31: 9, which are connected to time channels belonging to them 25; 1.17) until all time channels are occupied in such a way that each pulse frame has 32 time channels selected and has 35 channels of which 30 time channels are voice channels will be laid. and of which 2 time channels signaling and 2. The method according to claim 1, thereby serving synchronization purposes. So there will be indicates that in the time channel selection with a PCM time division multiplex telecommunications network to which this the series of all even-numbered (2,4, 6 ... 30) or values are used as a basis for the transmission of the series of all odd-numbered time channels (1, 3, 40 of voice information 64 k bit / s are transmitted. 5 ... 31) is started, and that the pure leads the aforementioned sampling frequency of 8 kHz equidistant time channels from which one is then selected for the transmission of telephone (e.g. 3, 7, 11 ... 31) only speech information is sufficiently intelligible, every second time channel of the equidistant series The transmission of radio programs, from (1, 3, 5 ... 31), which are based on the 45 image signals in connection with the image wandering previous selection is left over and facsimile signals are required, against a much higher sampling frequency. Around the transmission of these with a higher frequency keyed information in PCM telecommunications networks 50 to be able to carry out those mentioned above time assignments are based, one can determine the bits of the binary words through which the amplitude In telephone switching systems, in which the instantaneous values of such picture or broadcasting time division multiplex principle Use is made, signals can be mapped onto several time channels Lately the so-called pulse code modulation 55 divides, which in the switching each one of the transfer (PCM) special meaning. Experience independent treatment with these modular canals tion type become periodically consecutive (see NTZ-1967, Issue 11, 677 to 682, e.g. 676 B7 Times the amplitude instantaneous values of the and 677 B 8). Speech signal mapped by binary words, which then distribute information to several be transmitted. The basic task of a PCM 60 time channels of a pulse frame can also be achieved by this Time division switching center is then that it is necessary that the amplitude gradation, the on the one leading to the exchange with the one in the agreed PCM telecommunication networks PCM reception time multiplex lines in Zeitkanä- used to map the information len, which is possible for the individual connection 8-bit codes on these lines, is not sufficient, which is in the fertilizers are allocated, binary words occurring to 65 occurrence of quantization noises shows the corresponding to the desired connection are perceived as annoying. In such a selected case leading away from the exchange then a code with a higher number of bits, PCM time division multiplex lines to be switched through, for example with 14 bits used, the example